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在燃烧室入口来流马赫数为2.5的条件下,研究乙醇燃烧加热空气污染物对煤油超声速燃烧的影响.在加热器中,采用预混稳态燃烧火焰模型和61组分388步详细反应机理模拟乙醇燃烧加热过程,获得与实验温度条件相同的详细污染出口组分组成.其主要污染空气作为煤油超声速燃烧室的入口组分,采用17组分30步反应机理模拟煤油超声速燃烧过程,研究了污染物组分对煤油超燃室性能的影响.通过化学动力学和热力学分析,对比了地面电加热、乙醇燃烧加热和25km高空三种工况.结果表明:由于自由基作用以及平均分子质量的减小和平均比定压热容的增加,乙醇燃烧加热污染空气造成超燃室的燃烧效率和内推力均上升.
The effect of ethanol combustion heating air pollutants on supersonic combustion of kerosene was studied under the conditions of a Mach number of 2.5 at the inlet of the combustor.In the heater, a pre-mixed flame combustion model and a 388-step detailed reaction mechanism Simulation of ethanol combustion heating process, obtained with the same conditions as the experimental temperature contaminated outlet composition of the main pollution of the air as the kerosene supersonic combustion chamber inlet component, using 17-component 30-step reaction mechanism of kerosene supersonic combustion process was studied The effects of pollutants composition on the performance of kerosene chamber were discussed.The chemical kinetics and thermodynamic analysis were compared with those of surface electric heating, ethanol combustion heating and 25km altitude.The results showed that due to the free radicals and the average molecular weight Decreasing and increasing the average pressure-heat capacity, the combustion efficiency and the thrust force of the combustion chamber increase due to ethanol combustion heating the polluted air.